Chemical fire-extinguisher.



burrs scrar PATENT MAX BRESLAUER, OF CHARLOTTENBURG, GERMANY, ASSIGNOR TO THE FIRM W. GRAAFF GOMPAGNIE, GES. MIT BESCHR. HAFTUNG, OF BERLIN, GERMANY.

CHEMICAL FIRE-EXTINGUISER.

Specification of Letters Patent.

- Patented Jan. 14;, 1908.

Application fil d iu uscco. 1906. Serial 110.332.725-

Chemical fire-extinguishers have become.

known already, in which a container for acid filled with a solution of phosphoric acid and capable of being easily broken, is arranged in the breakable charging vessels.

the receptacle for containing the fire-extinguishing liquid. In spite of all precautions taken in packing these apparatuses, for transportation, it is not of rare occurrence that the vessels filled with [the acid solution, will break in shipment, the contents of the vessels causing damage in some part or the other.

This difiiculty is avoided according to my invention by providing the acid containing vessel, instead of with a filling of liquid acid, with a substance, which consists of a powder which forms the acid hydrate in contact with the extinguishing liquid only.

In the case under consideration anhydrous phosphoric acid is made use of as a filling for 'VVhen such kind of vessel is crushed after the insertion in the fire extinguishing a paratus, the hosphoric acid anhydrid w' lcombine wit the water of the extinguishing liquid most eagerly to form phosphoric acid, which lat ter in its turn combines with the-extinguishing liquid, so as to generate the gas required for the 0 eration of the fireextinguisher.

Thea vantages of the employment of the anhydrous phosphoric acid are the following:ln the first place the ease of manipulation and the harmlessness of the charging vessels, filled with anhydrous phosphoric acid, should be pointed out. The transportation of the anhydrous phosphoric acid is rendered harmless and without danger by the fact,sthat'when a tube is broken in the receptacle used for shipment, no li uid will escape from the latter, which would e liable to spoil the contents of other packages when the tube or apparatus is for instance shipped.

by mail. The dry powder on the contrary will remain in the interior of the vessel used lasts for a very long time, it might attack at the utmost only the-inside walls of the receptacle to a very slight extent. Hence, there is no necessity to take so much care and pains in the packing and making-up of the powder tubes, as when handling tubes with liquid contents. This results also in the absence of any trouble in shipment. sides the mere manipulation of a owder tube is less dangerous than the handling of a tube filled with liquid.

Though the, phosphoric acid referred to in my application for U. S. Patent, Serial Number 295206 will attack textile fabric and the like to a small extent only and even then only after operating upon it for along time, yet it is considerably more convenient, in

case a tube is broken by dropping upon a textile fabric or by dropping upon some resistance above said'fabric, to have this tube filled with a powder instead of charging it with a liquid, inasmuch as the dry powder spreading upon the surface of the fabric can be removed more quickly, and in a more reliable and easy manner, than a liquid which will be absorbed by the fabric. Thus, the employment of a tube filled with anh drous phosphoric acid, is beyond doubt muc more convenient to operate with as. regards shipping and handling and less dangerous than for shipment and, when the transportation a tube filled with phosphoric acid. Also, as

regards the initial pressure generated in the fire extinguishing apparatus consequent iipon the crushing of the inserted acid con tainer, the anhydrous phosphoric acid can be used to great advantage, inasmuch as the initial pressure, though by no means being equal to theinitial pressure produced when making use of strong acids, 1s yet considerably higher than the initial pressure which can be obtained by the use of tartaric acid, which will be apparent from the hereinafter submitted table in which comparative tests are com iled which have been made with tubes, ed with sulfuric acid, hydrochloric acid, anhydrous'phosphoric acid and tartaric acid. The substances used for filling the exchangeable acid vessels had the usual concentration. The testing ap aratuses were filled with 6 liters of water to w ich hadbeen added the same quantity of sodium bicarbonate.

rature It .follows from'this that the initial pressure generated when using anhydrous phosphoric acid. is about equal to half the ressure obtained when using 'hYdI'OGhOlOIlO acid, and equal to one the pressure obtained with sulfuric acid'and finally equal to 2.4

. times the initial pressure produced when making use of tartaric'acid, from which it a pears that as regards the initial 0 tained anhydrous phosphoric :a'ci admits of obtaining the advantages realized by. the' "drous phosphoric acid.

ressure use of phosphoric acid-in liquid form and it follows from this moreover, that the anh drous'phosphoric acid combines in itself t e advantages of the employment .of tartaric acid and of phosphoric acid, while on the other hand' it 1s superior as regards efficiency to tartaric acid, the efiiciency of which is too weak altogether in fire extinguishing apparatuses of this kind. What I claim and desire to secure by Letters Patent of the United States is Chemical fire extinguisher, in which the filling of the acid-container consists of anhy- In witness whereofI have hereunto signed my name this. eleventh day of August 1906, in the presence of two subscribing witnesses. MAX BRESLAUER Witnesses:

HENRY HASPER, WOLDEMARY HAUPT. 

